What do the names Sgt. Snorkel, General Halftrack, Plato, and Zero have in common?

1. Characters from the 'Peanuts' comic strip
2. Characters from the show 'Hogan's Heroes'
3. Names of characters from the show 'M.A.S.H.'
4. Names of characters from the 'Beetle Bailey' comic stripSolution

16th

The 'Paul is Dead' hoax which was encouraged by the Beatles sent streams of Beatles fans looking for clues to Paul's supposed death. Much of this was precipitated by a supposed backwards message claiming Paul's death on which Beatles song?

1. I'm So Tired
2. For No One
3. Hello Goodbye
4. Fixing a HoleSolution

17th

Many fossil collectors own unusual specimens called coprolites. What is fossilized to make a coprolite?